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SARG/DOLORES Quick-switch Successfully Tested at TNG

In the night of February 1st 2002, a first experiment of "on-fly" multi-instrument observation with SARG and DOLORES has been successfully carried out at the TNG. Alberto Buzzoni and Antonio Magazz¨ took in charge the observations, with the assistance of Juan Carlos Guerra as telescope operator and Alessandro Caproni as instrument software manager.
Multicolor imaging along with Low- and High-resolution spectroscopy has been carried out during the night for the ToO project on SN2002ap (PI: E. Pian, INAF Trieste) and three service programmes including imaging of comet Tempel 1 (PI: G.P. Tozzi, INAF Arcetri/Firenze), and spectroscopy for the COROT stellar sample characterization (PI: E. Poretti, INAF Brera/Milano), and for the study of Galactic halo dynamics (PI: C. Cacciari, INAF Bologna).
SARG and DOLORES have been used in parallel mode, by keeping both instrument "alive" all the time and directly available to the observer. Software and operational procedures have been tuned up in order to reduce full deadtime of instrument switch to less than 10 minutes. After the experimental phase for service observations, the SARG/DOLORES parallel facility will soon be made available also for observing programmes of visiting astronomers.

Feb 01 DOLORES image of SN2002ap in the Sc galaxy M74. The target is the blue star of V~13 clearly visible near the center of this 9'x 9' frame. SARG/DOLORES observations revealed quite peculiar spectrophotometric properties for this object, likely related to a Hypernova event. The real-color image, processed by combining the UBVRI photometry, is courtesy of S. Covino (INAF Brera/Milano). The spectrum of star AF-050 (V = 16.6), taken on Feb 01 with the DOLORES High-res blue grism (Gr#5). Exposure time was 800 sec with a 1.0" slit. This star is known to belong to the outermost region of the Galaxy halo, around the North Galactic Pole. A study of the kinematics of this class of objects gives important clues on the overall Halo dynamics. The image is courtesy of A. Bragaglia (INAF Bologna).
The raw SARG image of the spectrum of star HD 56990 (V = 7.7), for the COROT space mission target sample, taken on Feb 01, with a 600 sec exposure time and R= 57,000 inverse resolution, in the spectral range between 4600-8000 Angstroms. Comet Tempel 1, at a distance of 670 million of kilometers from Earth, as imaged by DOLORES in the Johnson R band. Each frame is a 20 min exposure on a 1.2'x 2.1' field. Telescope differential tracking on the target made stars to appear as elongated objects. The comet is the faint (R~23) point-source near the center of the frames, as indicated. An asteroid crossed the field during the exposures, and appears as a (moving) track at the bottom of the two frames. The observations for Tempel 1 are in the framework of target characterization for the Deep Impact space mission, forseen by NASA for year 2005.

AB/Feb 2002